Manchester United are monitoring Wolfsburg full-back Ricardo Rodriguez, according to the player's agent.
Rodriguez, 22, was heavily linked with moves to both United and Liverpool after impressing last term in the Bundesliga and during the 2014 World Cup with Switzerland.
But Wolfsburg resisted and convinced the left-back to commit to a new contract in January, which will keep him at the club until 2019.
However, according to Rodriguez's agent Gianluca di Domenico, United are one side who are undeterred and maintain their interest in signing the defender.
"I can say that United have called for information, but that Wolfsburg do not want to give in. With Real there was nothing official," he told Gazzetta dello Sport, Tutto Mercato report.
Di Domenico added his client also has a release clause of €30m (£21m, $32m) in his contract.
United's interest in Rodriguez appeared to have ended when they spent close to £30m to bring Luke Shaw to the club from Southampton in 2014.
The 19-year-old has been in and out of manager Louis van Gaal's first team this season having struggled with a succession of hamstring injuries, despite rarely visiting the treatment room during his time on the south coast.
Marcos Rojo, who operates at left-back for Argentina, has filled in for Shaw in his absence this term, while Daley Blind is also capable of providing cover.
United and Van Gaal are expected to make further changes to the club's options at the back, with a clear out that could include four defenders expected to take place in the summer.
Should United pursue their interest in Rodriguez, the club will likely to have little choice but to meet his release clause. Wolfsburg, second in the Bundesliga and nine points clear of third place Borussia Mönchengladbach, are on course to secure Champions League football next term, inspired by the form of Kevin de Bruyne, who has also been linked with a move to Old Trafford.